Motor control system and method for skipping resonant operating frequencies
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United States of America Patent
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Oct 18, 2016
Grant Date -
Feb 11, 2016
app pub date -
Aug 11, 2014
filing date -
Aug 11, 2014
priority date (Note) -
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Abstract
A system and method of avoiding hunting behavior by a motor around disallowed speed ranges. A sensor or sensorless method determines the motor's actual speed. A memory contains lower and upper speed values that define a disallowed range. A control unit determines whether the motor is operating under a limiting condition and engaged in hunting behavior by determining whether the motor is repeatedly moving between an actual speed that is within the disallowed range and an actual speed that is at or below the lower speed value during a first period, and if so, sets a temporary speed limit for the motor at the lower speed value for a second period. The first period may be the time required for the motor to change its actual speed a few times and thereby confirm hunting behavior. The second period may be sufficiently long that the limiting condition may have changed.
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